Being only 40, I came along as the trading stamps were fading (my primary knowledge of them comes from the Brady Bunch). But I do remember that Safeway still had stamps into the 80s (complete with the dial dispensers mentioned above), and one of my pre-teen chores was helping Mom stamp all the stamps down into the books. Blech.
My partner used to work for The Carlson Companies (the company formerly known as the Gold Bond Trading Stamp Company, and knowing all about those golden years in the company's history was required; they issued you a copy of Curt Carlson's biography, Good As Gold, when you started workign there) when they tried to re-invent the concept electronically as Gold Points with electronic cards. For a while (around '97) they had a lot of partners (Carlson-owned stuff like Radisson and TGI Fridays, plus a lot of other ones like Rainbow Foods, Tires Plus, and a some other random ones). One of the perks of working for Carlson is that every once in a while they'd have to clean out the warehouse of items that weren't too popular, and they'd take employee bids on them. I still have a coffee table that she bid $4 for. The system, however, turned out not to be too successful, and all of the non-Carlson partners dropped by 1999 and it essentially became Radisson's hotel loyalty program (now renamed the Carlson Club).